中高速船航行姿态及阻力数值预报方法研究

Study on the Numerical Prediction Method of Calculating the Sailing State and Resistance for Medium & High Speed Ship

针对中高速船不同航速下航态变化显著的特点,基于RANS方程与重叠网格技术,提出了船舶姿态及阻力的数值预报方法.以DTMB 5415为研究对象,开展了傅氏数Fr=0.28及0.41下船模航行状态的数值模拟,计算结果表明,研究航速下,船模升沉及纵倾的预报误差可控制在4%及10%以内,阻力预报误差小于3%,同时该方法能够较为准确地捕捉船体兴波流场的细节信息,可为中高速船快速性预报提供可行途径.

The sailing state can be remarkably different when a displacement ship advancing with vari- ous high speeds in calm water. A method is presented to calculate the sailing state and resistance for medium ＆ high speed ship based on Reynolds Averaged Navier-Stokes （RANS） equations and overset mesh. The surface combatant DTMB 5415 is chosen as an example to verify the method＇s feasibility by simulating the ship＇s hydrodynamic performance with Fr=0. 28 and 0.41. The results show that the errors of the calculated sinkages and trims can be controlled within 4% to 10% and the errors of the calculated resistances are less than 3 %. Meanwhile, the current method can more accurately cap- ture the ship wave profiles, which provides a feasible tool for the prediction of sailing states and resistances of medium ＆ high speed ship.